Marking guide



A rili's, 1925. 1,535,980

N. I. CAMPBELL ET AL MARKING GUIDE Filed Sept. 5, 1923 Patented Apr. 28, 1925.

UNITED PATENT-1 OFFICE.

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' MARKING. some.

Application filed September shown, described and claimed.

I The leading object is to make a marking 'guide'for use upon round objects such'as pipe for marking the object to be cut at an angle, the cutting to be done witha hack saw, cutting torch, or the like), as inmaking right angled elbows and other angular'constructions. 1

Other objects and advantages will ,appear from the drawings and specification.

The drawings illustrate a marking guide embodying the principles of our invention and illustrate its use. Y

Fig. 1 is'a view of the marking guide unrolled upon a flat surface.

Fig. 2 is a plan view of themarking 1 guide applied to a pipe.

Fig. 3 is an elevation of the view in Fig. 2. Fig. i is a plan view of a completed joint made by cutting a pipe on the angle formed by the marking guide illustrated in Figs. 1

Fig. 5 illustrates a modification of the'invention in which marking guide openings are provided'for marking on a pipe the'line of intersection therewith of any one of sevepalplanes meeting the pipeat different an-' g GS; f c

The details and operation shown in the drawings are as follows:

The rectangular plate 15 is preferably formed of transparent material such as celluloid and isflexible so that'it may be easily wound around the object to be marked. The two opposite end edges 16 are a sufficient distance apart to allow the plate 15 to reach around-the object tov be marked. The

edges 16 are reinforced by straps 17. The

two side edges of'the late 15 are reinforced by straps 18 secured t ereto and provided atcorres onding-ends with buckles 19 and at. opposite ends with free tongues 20 adapted to engage the buckles. Prefer'abl", each marking guide is constructed to a: J oipe '5, 1923. Serial no. 661,033.

or the like of a certain diameter? The line v' of intersection-which it is .desired to mark upon a'pipe is laid out in development upon the fiat surface of the stencil 15 and narrow slots or perforations 21 out upon thisline, as shown in Fig.1.

In application of the marking guide, it is rolled about a pipe 22', as shown in Fi 2, and the tongues 20 of straps18 secure in buckles 19, the operator being. careful in adjusting. the marking guide before tightening the straps 18' so that the abutting edges 16 are parallel with the axis of the pipe 22. The marking guide is used mainly of the pipe 22, as section 23, 180 degrees sectionof pipe 22, as shown in Fig. 4. It is therefore necessary that the marking guide be so turned about the axis of pipe 22 "that the lane determined by perforations 21Ishali be perpendicular to the plane in for marking pipe to be cut for" making joints by rotating one of the divided ends about its axis and welding it to the other i which the angle of the joint in the pipe 22 I is desired to lie.

The marking guide 15 being secured to the pipe 22, as shown in Fig. 2, in proper adjustment, paint is applied to pipe 22 through perforations 21 and the marking guide is then removed.

While it is thought to be easier to make "the'mark'with a suitable paint, it isobvious that, the mark may be scratched with a tool with a cutting torch and the mark should" be such as will remain as long .as possible under theaction of the torch.

such as a prick punch, chisel, or scratcher',

It can thus be seenthat we have provided a very simple,.-durable and inexpensive P marking gulde which is accurately and easily operated. In case it may be desired to use one markmg guidefor delineating the intersection of a plane with a pipe at different angles, perforations may be provided in the marking guide, "as shown in-Fi 5, in

development of the various lines. o intersection it isdesiredto delineate.

be cutat angles-of 45 and 30 an 20 and at any desired point between these angles.

' The; principal use is in imarkin ,pipe to" The intention is that in shops Where a. large amount of ipe cutting is to be done, the marking gui es will be made and laid I out especially for the pipe to be handled and the angles to be cut.

While We prefer to use transparent celluloid so that the operator can see through the celluloid to locate the markeproperly upon the pipe, it is not necessary that the sheet be transparent. Other means of locating the starting point of the mark might be devised.

What We claim is:

1. A marking guide comprising a sheet adapted to be Wrapped around a pipe and having perforations laid out so that the pipe NELSON I. CAMPBELL. A. M. HERBSMAN. 

